Control system of hybrid construction machine

Abstract

A control system of a hybrid construction machine includes fluid pressure pumps configured to supply a working fluid to a fluid pressure actuator, a regeneration unit having a regeneration motor for regeneration to be rotated by the working fluid discharged from a load side pressure chamber of the fluid pressure actuator, a rotating electric motor coupled to the regeneration motor, and a storage battery configured to store electric power generated by the rotating electric motor, and a variable throttle configured to bleed a portion of the working fluid obtained by excluding a flow rate of the working fluid guided to the regeneration motor from the working fluid discharged from the load side pressure chamber.

1 . A control system of a hybrid construction machine, comprising:
 a fluid pressure pump configured to supply a working fluid to a fluid pressure actuator;   a regeneration unit having a regeneration motor for regeneration to be rotated by the working fluid discharged from a load side pressure chamber of the fluid pressure actuator, a rotating electric motor coupled to the regeneration motor, and a storage battery configured to store electric power generated by the rotating electric motor; and   a variable throttle configured to bleed a portion of the working fluid obtained by excluding a flow rate of the working fluid guided to the regeneration motor from the working fluid discharged from the load side pressure chamber.   
     
     
         2 . The control system of the hybrid construction machine according to  claim 1 , wherein
 the variable throttle adjusts a bleed flow rate in such a manner that the working fluid guided to the regeneration motor does not exceed a regeneration amount of the regeneration unit.   
     
     
         3 . The control system of the hybrid construction machine according to  claim 2 , wherein
 in a case where a temperature of the storage battery is higher or lower than a preliminarily regulated range, the regeneration amount of the regeneration unit is set to be lower than in a case where the temperature of the storage battery is within the preliminarily regulated range.   
     
     
         4 . The control system of the hybrid construction machine according to  claim 2 , wherein
 in a case where a SOC of the storage battery is higher than a preliminarily regulated capacity, the regeneration amount of the regeneration unit is set to be lower than in a case where the SOC of the storage battery is within a preliminarily regulated capacity range.   
     
     
         5 . The control system of the hybrid construction machine according to  claim 3 , wherein 
       in a case where a SOC of the storage battery is higher than a preliminarily regulated capacity, the regeneration amount of the regeneration unit is set to be lower than in a case where the SOC of the storage battery is within a preliminarily regulated capacity range. 
     
     
         6 . The control system of the hybrid construction machine according to  claim 1 , further comprising:
 a regeneration switching valve configured to block the working fluid guided from the load side pressure chamber to the regeneration motor at the time of failure of the regeneration unit.   
     
     
         7 . The control system of the hybrid construction machine according to  claim 6 , further comprising:
 a controller configured to execute regeneration control of the hybrid construction machine, wherein   the variable throttle and the regeneration switching valve are switched by a single control signal from the controller.